Bad idea doing this. However, you have a missing step. I need to enable 434 for a specific app. Once done, I undo the changes. After changing XProtect.meta.plist file, you've likely changed its permissions to:
-rw-------
You need to fix those permissions for the system to use the file. The permissions should be:
-rw-r--r--
Fix the permissions with:
sudo chmod 644 /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta. plist
An even better option is to use the defaults command. That way you can quickly change it and change it back when you are done. Below is the method to enable Java 1.6.0_37-b06-434, followed by re-enabling Java 1.6.0_37-b06-435 for when you're done.
# Re-enable Java 1.6.0_37-b06-434
defaults write /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta JavaWebComponentVersionMinimum -string 1.6.0_37-b06-434
chmod 644 /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta. plist
# Re-enable Java 1.6.0_37-b06-435
defaults write /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta JavaWebComponentVersionMinimum -string 1.6.0_37-b06-435
chmod 644 /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta. plist
To change the Plugin Bundle version:
defaults write /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta MinimumPlugInBundleVersion -string 1.7.11.22
chmod 644 /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta. plist